Time-Bounded Execution

The following tables list the NI Vision VIs that support time-bounded execution. Keep the following in mind when developing time-bounded sections of the application.

• Always resize destination images to their proper size before beginning timed execution unless otherwise noted in the endnotes.
• Do not perform array operations that resize the data. These operations request resources from the system, cause excessive jitter, and invalidate timing.

VIs that Support Time-Bounded Execution

The following VIs support time-bounded execution.

IMAQ Absolute Difference IMAQ Add IMAQ And IMAQ ArrayToColorImage IMAQ ArrayToImage IMAQ BCGLookup IMAQ Bisecting Line IMAQ Build CoordSys (Points) IMAQ Centroid IMAQ ColorBCGLookup IMAQ ColorThreshold IMAQ ColorToRGB IMAQ ColorUserLookup IMAQ Compare IMAQ Convex Hull1 IMAQ Convolute IMAQ Divide 2 IMAQ EdgeDetection IMAQ Equalize IMAQ Expand IMAQ Extract IMAQ ExtractColorPlanes IMAQ ExtractSingleColorPlane

IMAQ FillImage IMAQ GetColorPixelValue IMAQ GetImageInfo3 IMAQ GetImageSize IMAQ GetOffset IMAQ GetPixelValue IMAQ ImageBorderOperation IMAQ ImageBorderSize2 IMAQ ImageToImage IMAQ Inverse IMAQ Is Vision Info Present 2 IMAQ Label1 IMAQ Lines Intersection IMAQ LogDiff IMAQ LowPass IMAQ MagicWand IMAQ Mask IMAQ MathLookup IMAQ Mid Line IMAQ Modulo IMAQ MulDiv IMAQ Multiply IMAQ MultiThreshold

IMAQ Or IMAQ Particle Filter 31 IMAQ Perpendicular Line IMAQ Polygon Area IMAQ ReplaceColorPlane IMAQ Resample IMAQ ROIToMask4 IMAQ Rotate IMAQ Rotation Detect IMAQ SetColorPixelLine 2 IMAQ SetColorPixelValue IMAQ SetOffset IMAQ SetPixelLine IMAQ SetPixelValue IMAQ SetRowCol IMAQ Shift IMAQ Subtract IMAQ Symmetry IMAQ Threshold IMAQ UserLookup IMAQ Xor

1. The destination image must be the source image.
2. Only the Get option is supported.
3. The Image Name indicator is not supported.
4. The Image Model control is required.

Preallocated VIs

The following VIs have preallocated versions in Preallocated.llb that support time-bounded execution. Use the preallocated version of these VIs in code that requires time-bounded execution.

Note  Before you save, download, and run these VIs or any timed execution VIs on your RT target, run the Configure LabVIEW for Timed Execution VI (vi.lib\vision\preallocated.llb) at least once on your host machine and close LabVIEW completely. If you do not run the Configure LabVIEW for Timed Execution VI or forget to close LabVIEW completely, LabVIEW may prompt you to resave some of the VIs in preallocated.llb with incorrect settings.

IMAQ AutoMThreshold IMAQ BuildKernel IMAQ Caliper Tool IMAQ ColorHistogram IMAQ ColorHistograph IMAQ ColorImageToArray IMAQ ColorMatch2 IMAQ ColorValueToInteger1 IMAQ Convert Pixel To Real World IMAQ Convert Real World To Pixel IMAQ Fit Circle 2 IMAQ Fit Line IMAQ Get Angles

IMAQ GetColorPixelLine IMAQ GetKernel IMAQ GetPalette IMAQ GetPixelLine IMAQ GetPointsOnLine IMAQ GetRowCol IMAQ Histogram IMAQ Histograph IMAQ ImageToArray IMAQ IntegerToColorValue1 IMAQ Interpolate 1D IMAQ Line Gauge IMAQ LinearAverages

IMAQ LineProfile IMAQ MaskToROI IMAQ Match Pattern 2 IMAQ Particle Analysis IMAQ Particle Analysis Report IMAQ Peak-Valley Detector IMAQ Point Distances IMAQ Quantify IMAQ Refine Matches IMAQ ROIProfile IMAQ Simple Edge IMAQ TransformROI

1. 2D versions show excessive jitter.
2. The ROI Descriptor is not supported.